Synthesis of nanostructured titania/zirconia membrane and investigation of its physical separation and photocatalytic properties in treatment of textile industries wastewater

Synthesis and Characterization of Fe3O4/Chitosan/TiO2 Nanoparticle Novel Nanocarrier and Investigation of In Vitro Release of Vancomycin on HeLa Cancer Cell

Nanocarrier systems have gained significant attention in recent decades as an alternative to conventional drug delivery methods, which often suffer from various limitations. In this study, Fe3O4/chitosan/TiO2 nanoparticles were synthesized as a novel nanocarrier for targeted drug delivery. The loading efficiency and controlled release behavior of vancomycin from the nanocarrier were evaluated under in vitro conditions using HeLa cancer cells. The in vitro study of the drug release behavior showed that the implementation of a titania coating significantly diminishes the drug release rate. Specifically, approximately 90 ± 0.2% of the drug is released over a period of 16 h for samples without the titania coating, while samples with the coating exhibit a release time of 25 h. The MTT assay indicates that the application of TiO2 nanoparticles on the nanocarrier resulted in a decrease in cell viability from 90 ± 3% to 50 ± 2% at concentrations of 100 μg/mL and 500 μg/mL, respectively. These findings highlight the potential of the Fe3O4/chitosan/TiO2 nanocarrier as an efficient system for controlled and targeted drug delivery applications.

Fabrication and characterization of chitosan-based bionanocomposite coating reinforced with TiO2 nanoparticles and carbon quantum dots for enhanced antimicrobial efficacy

Polymer-based nanocomposite coatings that are enhanced with nanoparticles have gained recognition as effective materials for antibacterial purposes, providing improved durability and biocidal effectiveness. This research introduces an innovative chitosan-based polymer nanocomposite, enhanced with titanium oxide nanopowders and carbon quantum dots. The material was synthesized via the sol-gel process and applied to 316L stainless steel through dip-coating. Structural and morphological properties, including crystal structure, microstructure, elemental dispersion, particle size distribution, chemical composition, and surface morphology, were thoroughly characterized. The results demonstrated that carbon quantum dots and titanium oxide nanopowders were uniformly dispersed within the chitosan matrix, forming a homogeneous, non-agglomerated coating. The antibacterial efficacy of the synthesized samples against 7 different Gram-positive and Gram-negative bacteria was assessed through disk diffusion, minimum inhibitory concentration (MIC), and minimum bactericidal concentration (MBC) tests. The results confirmed the antibacterial activity of synthesized samples against most of the bacterial pathogens tested but exhibited stronger antibacterial effects on Gram-negative bacteria compared to Gram-positive bacteria. The largest inhibition zones, measuring 21 mm and 16 mm, were observed for Pseudomonas and E. coli for titanium dioxide nanoparticles and the final nanocomposite, respectively. Additionally, the MIC and MBC values for all 7 bacteria were determined.